Artificial tooth.



PATENTED O'OT. 27,1903.

D. N. BOOTH. ARTIFICIAL TOOTH; APPLIOATION FILED JULY 11, 1903.

N0 MODEL.

I I. 2 /V Q W c w I in Artificial Teeth, of which the following is IPatented October 27, 19c s.

PATENT OFFICE.

DAVID N. BOOTH, OF NEW YORK, N. Y.

ARTIFICIAL TOOTH.

SPECIFICATION forming part of Letters Patent No. 742,572, dated October27, 1903. Application filed July 11, 1903. Serial No. 165,092. (Nomodel.)

To a. whom it may concern:

Be it known that I, DAVID N. BOOTH, a citizen of the United States,residing in the hon ough of Manhattan, city, county, and State of NewYork, have invented an Improvement a specification.

Myinvention relatesto artificial teeth adapted for use in crown andbridge work, and particularly to artificial teeth the parts of which areattachably connected to supports.

The object of my invention is primarily to provide an artificial toothin which the unsightly and disagreeable metallic backing heretoforecommonly employed in teeth of this kind is partially or entirelydispensed with.

In carrying out my operation I employ a tooth with a facing of suitablematerial, a backing preferably of the same material as the facing, apost to which both these aforesaid parts are to be connected andsecured, and a transversemetallic member preferably grooved andsecuredto said post, all of which parts will be hereinafter moreparticularly described.

In the drawings, Figure 1 is a perspective view of the major portion ofa tooth constructed according to my inventiomand Fig. 2 is a sideelevation of the same. Fig. 3 is a rear elevation of a tooth-facing, andFig. 4 is a similar view showing the facing connected to the metallicpost and transverse member. Fig. 5 is a side elevation of the post. Fig.6 is a rear elevation of the post with transverse member connectedthereto, and Fig. 7 is a side elevation of the same. Fig. 8 is acrosssection of the post. Fig. 9 is a vertical section through a toothfrom front to back. Fig. 10 is a cross-section on line no as, Fig. 9.Fig. 11 is a. cross-section on line y y, Fig. 9. Fig. 12 is an elevationand partial vertical section representing a row of connected teeth, andFig. 13 is a vertical section illustrating the application of myinvention to a pivot-tooth.

0. represents a facing of a tooth made of porcelain or other suitablematerial. The masticating surface or endof the tooth is preferably madeintegral with the facing a, and the back of the facing is provided witha longitudinal groove 3, extending from the neck of the tooth to andslightly below a shoulder 2 a short distance above themasticating-surface. The sides of the groove 3 are preferably undercut,and the base of the groove is advantageously made convex instead offlat.

b is a backing made of porcelain or of the same material as the facinga. The inner or flat surface of the backing b is provided with a groove4, similar to the groove 3 in the back of the facing, the said groove 4extending longitudinally the entire length of the backing Z). I alsoemploy a post or pin 0, preferably made of metal and having angulargrooves 5 extending along its opposite edges, the intermediate sidespreferably being slightly concave. This post a is provided with anundercut transverse recess 6 in one 'side adapted to receive atransverse metallic member at, which may be solid or of dovetailedshape, as shown in the drawings. The groove 3 in the back of the, facingis adapted to receive one portion of the post 0, and the groove 4 in theinner surface of the backing is adapted to receive the remaining portionof the said post 0, and these parts may be connected and securedtogether by cement or other suitable material. In forming a bridge ofteeth the posts cand transverse member (1 are first connected, and thenthe facings CL and backings b and filling portions are connected to theposts and transverse member to complete the intermediate teeth. Theseare then secured to the abutment teeth. When crowns are employed,the-ends of the transverse member are connected to the crowns and thefacings and backin gs and filling portions assembled and connectedafterward.

The transverse member d may be a solid body or bar connecting two ormore posts or placed in the groove of only one post. For the purposes ofmy invention it is not essential how the bar or member at is made orconnected to the posts. I prefer that said member or bar be grooved orformed as a bent-up strip to snugly fit the groove of a pin or thegrooves of several pins, and the parts should fit so securely that thereis absolutely no play or lost motion.

I have found that it is advantageous to have the backing I) extend fromthe neck of the tooth to approximately the top of the member d and tofill the space thus intervening between the bottom of the backing andthe shoulder 2 at the top of the rear portion of the masticatingsurfacewith gold or other suitable material 6.

It Will be evident that by extending the post 0 beyond the neck of thetooth, as shown in Fig. 13, my improvement may be made applicable topivot-teeth, in which instance I may dispense with the groovedtransverse member (1. The depth of the masticating end will be varied inthe various forms of teeth in order that the height of the tooth may bereadily adjusted and a proper fit secured.

I claim as my invention 1. An artificial tooth, comprising a support, adetachable facing, a detachable back-' ing, the said facing and backingbeing adapted to be connected and secured to the said support, and a barsecured to said support and passing transversely through the tooth.

2. An artificial tooth, comprising a post, a detachable facing ofporcelain, and a detachable backing of porcelain, said facing andbacking being adapted to be connected and secured to said post.

3. An artificial tooth, comprising a post, having grooves in itsopposite edges, a detachable facing of porcelain having a longitudinalundercut recess therein, a masticating end integral with said facing,and a detachable backing of porcelain having an undercut longitudinalrecess therein, the said grooves in the post being adapted to be received in the said grooves in the facing and backing.

4. An artificial tooth, comprising a metallic post having angulargrooves in its opposite edges, a detachable facing of porcelain havingalongitudinal undercut recess therein, a masticating end integral withsaid facing, a detachable backing of porcelain having a longitudinalundercut recess therein, and a metallic bar secured to said post andextending transversely through the said tooth, the said grooves in thepost being adapted to be received in the said grooves in the facing andbacking.

5. An artificial tooth, comprising a metallic post, a detachable facingof porcelain, a detachable backing of porcelain, said backing and facingbeing adapted to be connected and secured to said post, a metallic barsecured in said post and passing transversely through the tooth, and ametallic filling between the lower end of the backing and the shoulder 2of the masticating end of the tooth.

Signed by me this 26th day of June, 1903.

D. N. BOOTH.

Witnesses:

GEO. T. PINCKNEY, S. T. HAVILAND.

